Search found 12 matches

by ashraf2011
Mon Apr 15, 2013 4:20 pm
Forum: Introduction to Digital Electronics
Topic: #4 Kmaps [Post Homework Here]
Replies: 2
Views: 6077

Re: #4 Kmaps [Post Homework Here]

Q1: the methodes are bolean algebra and k-maps. Q2: C=AB+AB' C=A(B+B`) C=A(1)=A Q3: C=AB+A'B A \B 0 1 0 | 0 1 1 | 0 1 C=B Q4: simplyfing the logic circuit using bolean equations makes the circuit more simple and uses less parts of logic gates and so the cost of the circuit is reduced.
by ashraf2011
Sat Apr 13, 2013 8:48 pm
Forum: Introduction to Digital Electronics
Topic: #3 Logic Gates [Post Homework Here]
Replies: 2
Views: 6637

Re: #3 Logic Gates [Post Homework Here]

QUESTION 1: the 3 basic logic gates of digital electronics are AND , OR ,NOT gates. the AND gate symbole is =D the OR gate is =) ) and NOT gate symbole is =>0 QUESTION 2: the output of AND gate is only 1 if both inputs are high the output of OR gate is high if any one of the two inputs are high the ...
by ashraf2011
Fri Mar 29, 2013 4:50 pm
Forum: Introduction to Digital Electronics
Topic: #2 Number Systems [Post Homework Here]
Replies: 5
Views: 8182

Re: #2 Number Systems [Post Homework Here]

hi Chris.thanks a lot and thanks for all kick starters for this interesting course. and here is my answers for the second lecture: Q1 1.1(10)+1(10)=2(10) 2.1(2) + 1(2) =10(2) Q2 1.: 1010(2) + 1000(2)= 10010 2.1010(2) −1000(2)=0010 Q3 1. 1110(2)=0*2^0+1*2^1+1*2^2+1*2^3=14 2. 31/2=15R1 15/2=7R1 7/2=3R...
by ashraf2011
Sun Dec 09, 2012 11:57 pm
Forum: Projects
Topic: Simple Pyro RF Transmitter/Receiver (27 MHz)
Replies: 10
Views: 8503

Re: Simple Pyro RF Transmitter/Receiver (27 MHz)

hi Chris,,i have made the transmitter circuit but this time i generate different frequencies using timer 555,and different resistors values ,(actually it was an old piano circuit using timer 555) so that every frequency sent and received by the receiver circuit ;a micro controller is used to count e...
by ashraf2011
Fri Nov 09, 2012 7:10 pm
Forum: Introduction to Modern Electronics
Topic: #3 The Resistor [Post Homework Here]
Replies: 9
Views: 13881

Re: The Resistor [Post Homework Here]

[1]What is electrical resistance? its an electrical unite describe the voltage that has to be applied to pass unity of current from point to another. [2] What ‘Units’ are used to describe electrical resistance? OHM'S [3]Convert the value of 100,000Ω into Kilo-Ohm and Milliohm. 100,000 equals 100 koh...
by ashraf2011
Thu Nov 08, 2012 3:48 pm
Forum: Projects
Topic: FM Bug Transmitter Mint Box
Replies: 9
Views: 12215

Re: FM Bug Transmitter Mint Box

hi Chris,,i have modified the antenna to be 40 cm long and now i can receive the signal 5 meters long,, the longer antenna the worst signal i receive .i also tried an audio input from mp3 played and i received it on radio, but the sound wasn't pure there was a distortion in the signal. here is a pic...
by ashraf2011
Sun Nov 04, 2012 7:12 am
Forum: Projects
Topic: FM Bug Transmitter Mint Box
Replies: 9
Views: 12215

Re: FM Bug Transmitter Mint Box

now i modified the coil inductance in the circuit ,i make a coil with 5 turns,2.3 mm long and 10 mm diameter to get .09uh and capacitors for resonance 27 p and 4 p capacitor (connected between emitter and collector) i successfully received the FM on the radio with at 95 MHZ but the problem is the di...
by ashraf2011
Wed Oct 31, 2012 4:15 pm
Forum: Projects
Topic: FM Bug Transmitter Mint Box
Replies: 9
Views: 12215

Re: FM Bug Transmitter Mint Box

hi Chris,,i`v done all the circuit but i have a problem with the oscillator part,,the 6.8 p capacitor is not available in here,,so i would use a 4 pico farad capacitor across the collector and emitter of the transistor and 27 pico farad parallel to the coil, i make a coil with 9 turns, 0.5 mm wire d...
by ashraf2011
Tue Oct 18, 2011 9:16 pm
Forum: Projects
Topic: short range personal radar
Replies: 8
Views: 8125

thanks chris for your help..i found the problem was in the timers values for each interrupt,,i made a simple code using the same variable to control both servos..and the angels sequence is 80,70,80,90,50.. although the pulse for hitech servo sould start from .9 to 2.1 ..my servos in simulator respon...
by ashraf2011
Tue Oct 18, 2011 7:14 pm
Forum: Projects
Topic: short range personal radar
Replies: 8
Views: 8125

i `ve made the interrupt timer and set a variable to each low and high TMR1 Registers TMR1H & TMR1L but no signal generated. i `ve try to made the angle constant for all servos and signal generated correctly.why it didnt work with the variable angels. here is the programe of MikroC Compiler that...
by ashraf2011
Mon Oct 17, 2011 1:55 am
Forum: Projects
Topic: short range personal radar
Replies: 8
Views: 8125

problem with Mikroc compiler

thanks a lot for this helpful site...i have learned a lot from you.. i have made the code of multi servo control using Mikro c compiler but the problem is the TMR1 Register can`t be valued directly with 16 bit value but its divided into two registers TMRH WITH 8 BITS and TMRL with 8 bits so if i wan...
by ashraf2011
Wed Sep 21, 2011 3:37 pm
Forum: Tutorials
Topic: Xbee Wireless Interface
Replies: 35
Views: 28572

very helpful thanks

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